*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
h4{
    padding-bottom: 84px;
}
.header{
    text-align: center;
    background: #e9ecef;
    padding-top: 67px;
    color: #212529;
}
.footer{
    text-align: center;
    padding-top: 32px;
}
button{
    border: none;
    border-radius: 5px;
    outline: none;
}
#b1 button,#b2 button{
    font-size: 13px;
    font-family: 新宋体;
    padding:11px 47px;
    color:  #6c757d;
}
.b3{
    padding:11px 119px;
    margin: 0 173px;
    outline:none;
    background: #6c757d;
    color: #ffffff;
}
textarea{
    width: 539px;
    height: 132px;
    margin-top: 16px;
}
.t1,.t2{
    padding: 11px 11px;
}
.t2{
    margin-left: 25px;
    background: #e9ecef;
    font-family: 宋体;
    font-size: 18px;
    color: #6c757d;
}
.t3{
    color: #ffffff;
    background: #007bff;
    padding:16px 107px;
    font-family: 微软雅黑;
    font-size: 18px;
    margin-top: 20px;
}